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. 2017 May;52(5):464–473. doi: 10.4085/1062-6050-52.3.09

Table 1. .

Knee-Sprain Rates by Event Type in Youth, High School, and Collegiate Football Players, 2012 Through 2014 Seasons

Level of Play	Event Type
	Game			Practice			Overall
	Injuries, No.	AEs	Injury Rate per 1000 AEs (95% CI)	Injuries, No.	AEs	Injury Rate per 1000 AEs (95% CI)	Injuries, No.	AEs	Injury Rate per 1000 AEs (95% CI)
Youth
All injuries	13	44 583	0.29 (0.13, 0.45)	20	163 939	0.12 (0.07, 0.18)	33	208 523	0.16 (0.10, 0.21)
Time-loss injuries^a	7	44 583	0.16 (0.04, –0.27)	10	163 939	0.06 (0.02, 0.10)	17	208 523	0.08 (0.04, 0.12)
Severe injuries^b	4	44 583	0.09 (0.00, 0.18)	0	163 939	0.00	4	208 523	0.02 (0.00, 0.04)
High school
All injuries	165	221 105	0.75 (0.63, 0.86)^c	148	1 012 533	0.15 (0.12, 0.17)^c	313	1 233 637	0.25 (0.23, 0.28)^c
Time-loss injuries	125	221 105	0.57 (0.47, 0.66)^c	93	1 012 533	0.09 (0.07, 0.11)^c	218	1 233 637	0.18 (0.15, 0.20)^c
Severe injuries	77	221 105	0.35 (0.27, 0.43)^c	26	1 012 533	0.03 (0.02, 0.04)	103	1 233 637	0.08 (0.07, 0.10)^c
Collegiate
All injuries	226	52 014	4.34 (3.78, 4.91)^d,e	148	487 109	0.30 (0.25, 0.35)^d,e	374	539 124	0.69 (0.62, 0.76)^d,e
Time-loss injuries	156	52 014	3.00 (2.53, 3.47)^d,e	119	487 109	0.24 (0.20, 0.29)^d,e	275	539 124	0.51 (0.45, 0.57)^d,e
Severe injuries	80	52 014	1.54 (1.20, 1.88)^d,e	58	487 109	0.12 (0.09, 0.15)^d,e	138	539 124	0.26 (0.21, 0.30)^d,e

Abbreviations: AE, athlete-exposure; CI, confidence interval.

^a

Defined as resulting in participation-restriction time of at least 24 hours.

^b

Defined as resulting in participation-restriction time of more than 21 days.

^c

High school estimate greater than youth estimate (injury rate ratio [IRR] > 1.00).

^d

Collegiate estimate greater than high school estimate (IRR > 1.00).

^e

Collegiate estimate greater than youth estimate (IRR > 1.00).